Helicoidal Ordering in Iron Perovskites

Maxim Mostovoy
Phys. Rev. Lett. 94, 137205 – Published 6 April 2005

Abstract

We study the double exchange in transition metal oxides with itinerant and localized electrons. We show that the charge transfer energy Δ and the oxygen-oxygen hopping amplitude tpp have a strong effect on magnetic ordering: while for Δ>0 the ground state is ferromagnetic, for negative Δ and large tpp the double exchange gives rise to an incommensurate helicoidal ordering of local spins, observed, e.g., in the iron perovskites SrFeO3 and CaFeO3. For negative Δ, the metal-insulator transition into a charge-ordered state has little effect on magnetic ordering. This explains the difference in magnetic and transport properties of ferrates and manganites.

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  • Received 31 August 2004

DOI:https://doi.org/10.1103/PhysRevLett.94.137205

©2005 American Physical Society

Authors & Affiliations

Maxim Mostovoy

  • Max-Planck-Institut für Festkörperforschung, Heisenbergstrasse 1, D-70569 Stuttgart, Germany
  • Materials Science Center, University of Groningen, Nijenborgh 4, 9747 AG Groningen, The Netherlands

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Issue

Vol. 94, Iss. 13 — 8 April 2005

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